package de.nordakademie.sommer.sunshine.app;

import android.annotation.TargetApi;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

/**
 * Created by Robin on 06.11.2014.
 */
public class ForecastFragment extends Fragment {
    public static ArrayAdapter<String> mForecastAdapter;
    private ArrayList<String> mForecastData;

    public ForecastFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onStart() {
        super.onStart();
        updateWeather();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if(id == R.id.action_refresh) {
            updateWeather();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        // Setze Adapter
        mForecastAdapter = new ArrayAdapter<String>(getActivity(),R.layout.list_item_forecast, R.id.list_item_forecast_textview, new ArrayList<String>());

        // Hole Listview
        ListView listView =(ListView) rootView.findViewById(R.id.listview_forecast);

        // Kopple Listview mit Adapter
        listView.setAdapter(mForecastAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                Intent intent = new Intent(getActivity(), DetailActivity.class);
                intent.putExtra(Intent.EXTRA_TEXT, mForecastAdapter.getItem(position));
                startActivity(intent);
            }
        });

        return rootView;
    }

    private void updateWeather() {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String location = prefs.getString(getString(R.string.pref_location_key), getString(R.string.pref_location_default));
        new FetchWeatherTask().execute(location);
    }

    private String getReadableDateString(long time){
        Date date = new Date(time * 1000);
        SimpleDateFormat format = new SimpleDateFormat("E, MMM d");
        return format.format(date).toString();
    }

    private String formatHighLows(double high, double low) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String unitType = prefs.getString(getString(R.string.pref_units_key), getString(R.string.pref_units_metric));
        if(unitType.equals(getString(R.string.pref_units_imperial))) {
            high = (high*1.8) + 32;
            low = (low*1.8) + 32;
        } else if(unitType.equals(getString(R.string.pref_units_metric))) {
            Log.d("formatHighLows", "Unit type not found " + unitType);
        }

        long roundedHigh = Math.round(high);
        long roundedLow = Math.round(low);

        String highLowStr = roundedHigh + "/" + roundedLow;
        return highLowStr;
    }

    private String[] getWeatherDataFromJson(String forecastJsonStr, int numDays)
            throws JSONException {

        // These are the names of the JSON objects that need to be extracted.
        final String OWM_LIST = "list";
        final String OWM_WEATHER = "weather";
        final String OWM_TEMPERATURE = "temp";
        final String OWM_MAX = "max";
        final String OWM_MIN = "min";
        final String OWM_DATETIME = "dt";
        final String OWM_DESCRIPTION = "main";

        JSONObject forecastJson = new JSONObject(forecastJsonStr);
        JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST);

        String[] resultStrs = new String[numDays];
        for(int i = 0; i < weatherArray.length(); i++) {
            String day;
            String description;
            String highAndLow;

            JSONObject dayForecast = weatherArray.getJSONObject(i);

            long dateTime = dayForecast.getLong(OWM_DATETIME);
            day = getReadableDateString(dateTime);

            JSONObject weatherObject = dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0);
            description = weatherObject.getString(OWM_DESCRIPTION);

            JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE);
            double high = temperatureObject.getDouble(OWM_MAX);
            double low = temperatureObject.getDouble(OWM_MIN);

            highAndLow = formatHighLows(high, low);
            resultStrs[i] = day + " - " + description + " - " + highAndLow;
        }

        return resultStrs;
    }


    public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {
        private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();


        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @Override
        protected void onPostExecute(String[] result) {
            if(result == null) {return;};

            mForecastAdapter.clear();
            for(String str : result) {
                mForecastAdapter.add(str);
            }
        }

        @Override
        protected String[] doInBackground(String... params) {
            HttpURLConnection urlConnection = null;
            BufferedReader reader = null;
            String forecastJsonStr = null;

            String format = "json";
            String units = "metric";
            int numDays = 7;

            try {
                // Construct the URL for the OpenWeatherMap query
                final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?";
                final String QUERY_PARAM = "q";
                final String FORMAT_PARAM = "mode";
                final String UNITS_PARAM = "units";
                final String DAYS_PARAM = "cnt";

                Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon()
                        .appendQueryParameter(QUERY_PARAM, params[0])
                        .appendQueryParameter(FORMAT_PARAM, format)
                        .appendQueryParameter(UNITS_PARAM, units)
                        .appendQueryParameter(DAYS_PARAM, Integer.toString(numDays))
                        .build();

                URL url = new URL(builtUri.toString());

                // Create the request to OpenWeatherMap, and open the connection
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                // Read the input stream into a String
                InputStream inputStream = urlConnection.getInputStream();
                StringBuffer buffer = new StringBuffer();
                if (inputStream == null) {
                    return null;
                }
                reader = new BufferedReader(new InputStreamReader(inputStream));

                String line;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line + "\n");
                }

                if (buffer.length() == 0) {
                    return null;
                }
                forecastJsonStr = buffer.toString();
            } catch (IOException e) {
                Log.e("ForecastFragment", "Error ", e);
                return null;
            } finally{
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException e) {
                        Log.e("ForecastFragment", "Error closing stream", e);
                    }
                }
            }

            try {
                return getWeatherDataFromJson(forecastJsonStr, numDays);
            } catch (JSONException e) {
                Log.e(LOG_TAG, e.getMessage(), e);
                e.printStackTrace();
            }

            return null;
        }
    }
}
